<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>花坊OA系统</title>
    <script>
        var flag = sessionStorage.getItem('flag') // 如果flag缓存不存在，那么值为多少？null
        if (!flag) {
            window.location.href = './login.html'
        }
    </script>
    <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
    
    <div class="container">
        
        <h1>首页</h1>
        
    </div>
    
</body>
</html>